|Party|First Duma|Second Duma|Third Duma|Fourth Duma|
|---|---|---|---|---|
|Russian Social Democratic Party|18 (Mensheviks)|47 (Mensheviks)|19 (Bolsheviks)|15 (Bolsheviks)|
|Socialist-Revolutionary Party|–|37|–|–|
|Labour group|136|104|13|10|
|Progressist Party|27|28|28|41|
|Constitutional Democratic Party (Kadets)|179|92|52|57|
|Non-Russian National Groups|121|–|26|21|
|Centre Party|–|–|–|33|
|Octobrist Party|17|42|154|95|
|Nationalists|60|93|26|22|
|Rightists|8|10|147|154|
|TOTAL|566|453|465|448|

Question: how many parties had more than 50 seats in the third duma?
Answer: 3